Just got an arbor coda, the recommended stance seems to be right in the middle which is usually too wide for me. Normally I wouldn't care and put my bindings wherever I want, but it seems like arbor centered it on purpose because it is right over the grip tech spots.

Anyone know if I am going to notice much difference with the grip tech if I mount my bindings narrower than what arbor recommends?

I have mine outside the reference by one and it works fine. The Grip-Tech points are centered around the insert packs enough to where they will effectively carry your weight wherever you mount the bindings. It's a rad system ... carves like a BEAST.